Update: GAME has announced on their Twitter feed that Keldeo will be distributed at all of their stores.

The official Pokémon website has announced that a new Pokémon, assumed by the silhouette to be Keldeo, will be distributed in the UK in participating GAME and Gamestation stores for Black and White versions from September 1, 2012 until October 11, 2012, the day before Pokémon Black 2 and White 2 versions launch in Europe. The participating GAME and Gamestation stores are currently unknown.